Twilight Prowess 16-inch Carbine-Gas 1:16 .350 Legend AR-15 Freefloat M-Lok Handguard Rifle Complete Upper Build - Summer of 250 Sale

Twilight Prowess 16-inch Carbine-Gas 1:16 .350 Legend AR-15 Freefloat M-LOK Complete Upper

The Twilight Prowess is a .350 Legend AR-15 Complete Upper built around a 16-inch carbine-length gas platform. The kit centers on a 16-inch Balmung M4 profile barrel in 4150 CMV steel with a phosphate finish, 1:16 twist rate, and 5/8x24 thread pitch, paired with a GI birdcage flash hider compatible with .350 Legend, .308 Win, 7.62x39, and .300 Blackout, and a black 5/8-inch crush washer. A micro low-profile steel gas block at 0.750 diameter and a carbine-length stainless steel gas tube are included on the front end. The upper receiver is a USA-made 6061 slick side billet design in 6061 aluminum with an anti-rotation cutout, paired with a 15-inch freefloat M-LOK handguard in black aluminum with a full-length Picatinny top rail. A USA-made AR-15 complete bolt carrier group compatible with 5.56 NATO, .223 Remington, .300 Blackout, and .350 Legend, and a Mil-Spec AR-15 M4 charging handle complete the upper component set.

Key Features

• 16-inch Balmung M4 profile barrel, 4150 CMV steel, phosphate finish, 1:16 twist, 5/8x24 thread pitch
• Carbine-length gas system
• Carbine-length stainless steel gas tube
• Micro low-profile steel gas block, 0.750
• GI birdcage flash hider, black, 5/8x24, .350 Legend and .308 Win and 7.62x39 and .300 Blackout compatible, black crush washer included
• USA-made 6061 slick side billet upper receiver, 6061 aluminum, anti-rotation cutout
• 15-inch freefloat M-LOK handguard, black aluminum, full-length Picatinny top rail
• USA-made AR-15 complete bolt carrier group, 5.56 NATO and .223 and .300 Blackout and .350 Legend compatible
• Mil-Spec AR-15 M4 charging handle

Perfect For

• Builders sourcing a complete .350 Legend AR-15 upper with a USA-made slick side billet upper and USA-made BCG ready to pair with their own lower receiver
• Shooters building a 16-inch .350 Legend carbine-gas platform who want a 15-inch freefloat M-LOK handguard with a full-length Picatinny top rail covered in one complete upper
• AR-15 builders who want a 4150 CMV phosphate Balmung barrel with a compatible GI birdcage flash hider and USA-made BCG included without sourcing components separately

Barrel and Muzzle Device

The 16-inch Balmung M4 profile barrel is chambered in .350 Legend and constructed from 4150 CMV steel with a phosphate finish. The twist rate is 1:16 and the thread pitch is 5/8x24, which matches the included GI birdcage flash hider. The flash hider is compatible with .350 Legend, .308 Win, 7.62x39, and .300 Blackout at the 5/8x24 thread pitch. A black 5/8-inch crush washer, a micro low-profile steel gas block at 0.750 diameter, and a carbine-length stainless steel gas tube cover the front end gas configuration on this carbine-length platform.

Slick Side Billet Upper Receiver and Handguard

The USA-made 6061 slick side billet upper receiver is 6061 aluminum with an anti-rotation cutout. The slick side design removes the forward assist housing from the upper receiver body for a clean exterior profile. The 15-inch freefloat M-LOK handguard is black aluminum with M-LOK attachment points along the body and a full-length Picatinny top rail for optic and accessory mounting. These two components define the exterior structure of the upper assembly on this AR-15 platform.

Bolt Carrier Group and Charging Handle

The USA-made AR-15 complete bolt carrier group is compatible with 5.56 NATO, .223 Remington, .300 Blackout, and .350 Legend. A Mil-Spec AR-15 M4 charging handle is included to complete the upper component set.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws.